Modified mesoporous materials as Pd scavengers and catalyst supports

Crudden, Cathleen M.; McEleney, Kevin; MacQuarrie, Stephanie L.; Blanc, Alexandre; Sateesh, Mutyala; Webb, Jonathan D.

doi:10.1351/pac200779020247

Pure Appl. Chem., 2007, Vol. 79, No. 2, pp. 247-260

http://dx.doi.org/10.1351/pac200779020247

Modified mesoporous materials as Pd scavengers and catalyst supports

Cathleen M. Crudden, Kevin McEleney, Stephanie L. MacQuarrie, Alexandre Blanc, Mutyala Sateesh and Jonathan D. Webb

Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada

Abstract: The use of mesoporous molecular sieves (MMSs) modified by mercaptopropyl trimethoxysilane (MPTMS) to scavenge Pd is described. The ordered mesoporous material displays excellent ability to remove Pd from organic and aqueous solutions. After only one treatment, a 500-ppm solution of PdCl₂ in water can be reduced to 1 ppb. In addition, the resulting material is an effective, leach-proof catalyst for the Suzuki-Miyaura and Mizoroki-Heck reactions. Thus, the Suzuki-Miyaura reaction can be conducted in water at 80 °C with as little as 3 ppb Pd leaching. Hot filtrations and three-phase tests confirm that the catalyst acts without leaching Pd from the surface.